# flapping wing UDF code

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 July 24, 2012, 06:21 flapping wing UDF code #1 New Member   Yahya Azizi Join Date: Jul 2012 Posts: 8 Rep Power: 6 I'm simulating a flapping wing. The UDF code is as follows: #include "udf.h" #include "dynamesh_tools.h" real w, pi, Aroll, Apitch, roll, droll, pitch, dpitch, yaw, dyaw, frequency, T; real Ar, Ap, Ay; DEFINE_CG_MOTION(code, dt, v_cg, omega, time, dtime) { Thread *t; NV_S(v_cg, =, 0.0); NV_S(omega, =, 0.0); if (!Data_Valid_P()) { Message("Wrong\n"); return; } t=DT_THREAD((Dynamic_Thread*)dt); frequency = 3.0; pi = 3.141592654; /* define motion variables */ Ar = 30.0; /*roll amplitude*/ Ap = 5.0; /*pitch amplitude*/ Ay = 0.0; /*yaw amplitude*/ Aroll = Ar*pi/180.0; /*conversion to radians*/ Apitch = Ap*pi/180.0; /*conversion to radians*/ w=2.0*pi*frequency; /*omega (radians)*/ T=1.0/frequency; roll = Aroll*sin(w*time + pi/2); droll = w*Aroll*cos(w*time + pi/2); pitch = Apitch*sin(w*time+pi/2); dpitch = w*Apitch*cos(w*time+pi/2); /*euler angles initial frame mod 1*/ omega[0] = droll; omega[1] = 0; omega[2] = 0; Message("time:%f omegax:%f omegay:%f omegaz:%f \n", time, omega[0], omega[1],omega[2]); } I need to consider pitch and roll rotation simultaneously. However, when I add pitch rotation to the code the wing movement becomes wrong. Any idea what I should do about this?

 July 24, 2012, 06:24 #2 New Member   Yahya Azizi Join Date: Jul 2012 Posts: 8 Rep Power: 6 Is that because of using sinusoid function for pitch rotation or incorrect code?

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